Update to recommended Xcode build settings.

platform/macosx/love.xcodeproj/project.pbxproj

@@ -1683,7 +1683,7 @@
 		29B97313FDCFA39411CA2CEA /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 0420;
+				LastUpgradeCheck = 0430;
 			};
 			buildConfigurationList = C01FCF4E08A954540054247B /* Build configuration list for PBXProject "love" */;
 			compatibilityVersion = "Xcode 3.2";